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How to define the Reynolds Number in CFX?

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Old   November 6, 2013, 06:53
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Glenn Horrocks
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The streamlines are the velocity field. If you ignore that - then why bother doing CFD?
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Old   April 27, 2014, 03:32
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Quote:
Originally Posted by ghorrocks View Post
I do not understand your question. Are you having problems calculating the particle Re number? Are problems implementing you drag law?
Hi There,

Yeah I want to define Re Number as an expression in CFX-pre, and then drag coefficient. In that way I can define a new drag model than a common Schiller-Naumann correlation. Thank's a lot.

Regards,
Sep
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Old   April 27, 2014, 06:27
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Have you done the tutorials? They show you have to implement CEL expressions.
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Old   September 3, 2015, 22:09
Default How to check material properties valve in CFX.
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N B Khan
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How to check material properties valve in CFX. It just show the material like air, water.etc...no material propoerties here... Plz help me how to change the material properties...
I am new here and new in CFX.
Thanks in advance


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Originally Posted by Loris88 View Post
Hi ghorrocks!

Since you have said me to read this post, I will write here my question.
I have read the questions and the relative answers but I did not find the solution for my problem.
I have a 2D problem. I created the mesh with ICEM and then I extruded it with the shrewdness of to put as depth, 1 cell like thikness.

After importing the mesh in CFX, I have put boundary condition of symmetry for to simulate the 2D problem.

I have these measures of the rectangular channel:
-Length: 3900 mm
-Heigth: 50 mm (Characteristic length L)
-Depth: 1 cell like thikness
-Re= 80000 (known input of the problem)
-Velocity along x axis= 24 m/s (u) at the inlet. The other velocities are 0 m/s. No swirl component.
-Dynamic viscosity: 1.8058e-05 kg/m*s (alpha)
-Density: 1.20438 kg/m^3 (beta)
-Kinematic viscosity: alpha/beta= 1.4993e-5 (ni)

Re= (u*L)/ni ~ 80000 [for precision 80034]

But Ansys has given me Re=9.2723E+04

How can I do for to solve this problem?
Thanks
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Old   September 4, 2015, 01:58
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In CFX-pre in the tree to the left you have stuff like Simulation, Analysis Type, Solver, Coordinate Frames, and a thing called Materials. Right click, insert/material. Or from the menu in the top, click insert/material.
This is the easy part with CFD, and if you have problems with this you should at least do all the tutorials before doing anything else.
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Old   September 7, 2015, 00:59
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Thanks dear... This forum is really great for the beginner... it help me alot....


Quote:
Originally Posted by Lance View Post
In CFX-pre in the tree to the left you have stuff like Simulation, Analysis Type, Solver, Coordinate Frames, and a thing called Materials. Right click, insert/material. Or from the menu in the top, click insert/material.
This is the easy part with CFD, and if you have problems with this you should at least do all the tutorials before doing anything else.
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